Vaccinating gun



,Match 11, 1947.

F. J. swANsoN VACCINATING GUN v Filed April 17, 1945 ATr'n R N EYS@Patented Mar. 11, 1947 UNITED STATES PATENT OFFICE VACCINATING GUNFrancis J. Swanson, Saratoga, Wyo. Application April 17, 1945, SerialNo. 588,817

The invention relates to a gun and more especially to a vaccinating gunor serum shooter.

.The primary object of the invention is the provision of a gun orshooter of this character, wherein the same which is of standardconstruction can be operated single-handed, so as to enable theinjection of vaccine within a human being or an animal with ease anddispatch, the gun being equipped with a trigger mechanism, which isconveniently operated, to enable the gun to be much faster and moreaccurate than any ordinary guns now in use.

Another object of the invention is the provision of a gun of thislcharacter, wherein it is supplied with a pistol grip and a triggerhaving seal' action on the plunger, so that the gun can be operated withone hand and a graduated dose of vaccine can be discharged therefromfrom one to ve (1 to 5) cc. per stroke of the plunger with accuracy, thegrip and trigger fitting being of novel construction and is unique inthe arrangement thereof.

A further object of the invention is the provision of a gun of thischaracter, which is simple in construction, thoroughly reliable andeffective in operation, strong, durable, readily and easily handledsingle-handedly, accurate in the working thereof, readily and easilyadjusted, and inexpensive to manufacture and install.

With these and other objects in View, the invention consists in thefeatures of construction, combination and arrangement of parts as willbe hereinafter more fully described, illustrated in the accompanyingdrawing, which shows the preferred embodiment of the invention andpointed out in the claims hereunto appended.

In the accompanying drawings:

Figure 1 is a side elevation of a vaccine gun showing the pistol gripand trigger mechanism constructed in accordance with the inventionapplied thereto, the grip being partly n section.

Figure 2 is a fragmentary side view thereof.

Figure 3 is a sectional view taken on the line 3--3 of Figure 1 lookingin the direction of the arrows.

Figure 4 is a sectional view taken on the line 4--4 of Figure 1 lookingin the direction of the arrows.

Figure 5 is a sectional View taken on the line 5-5 of Figure 1 lookingin the direction of the arrows.

Figure 6 is a fragmentary side view partly broken away.

Figure 'l' is a sectional view taken on the line 'l-1 of Figure 6looking in the direction of the arrows.

4 Claims. (Cl. 128-2Z4) Figure 8 is a View similar to Figure 6 showingthe trigger in adjusted position.

Similar reference characters indicate corresponding parts throughout theseveral views in the drawing.

Referring to the' drawing in detail, A designates generally a vaccinegun or syringe of any standard construction, having a sight window I0 ineach side thereof, as usual, and this gun or syringe is provided with ahand actuated plunger II for dispensing the vaccine as contained withinthe same through a discharge nozzle or needle i2 of common construction.

The gun at its barrel I3 is fitted with a pistol grip or handle I4 whichhas the said barrel saddled at I5 therein, while this barrel I3 isadjustably clamped to the handle by a friction clip or band I6, which isheld fixed by a coupling bolt I1 anchored in a cross web I8 integrallyformed in the grip or handle I4.

On the grip or handle I4 `forwardly thereof is a forked bearing I9 inwhich is a vertically swinging trigger 20, which is journalled on ahorizontal pivot 2I fitting such bearing i9, the trigger being actedupon by a spring 22 which returns it to normal position after beingpulled for the operation of the gun or syringe A, as hereinafterdescribed.

Slidably fitted in guideways 23 and 2Q, respectively, as provided in thegrip or handle III is a throw link 25, which carries a cooking sear 2t,adapted for ratchet engagement with a toothed rack 21 formed on theplunger stem or shank 28, which is provided with exposed graduated scalemarks or indicators 29 longitudinally thereof which coordinate with ascale beam 3Q on the barrel I3 so that a determined amount of vaccinecan be dispensed from the latter on the automatic working of the plungerII for administering to a human being or animal from 1 to 5 cc. doses,the

gun being usable by medical or veterinary professions.

The gasket cap 3l of the barrel. i3 through which the plunger operatesis provided with a hand manipulated cam 3.2 which works against the link25 to throw the sear or dog Z out of engagement with the rack 21,against the resistance of an adjustable tensioning device 33 fittedwithin the grip or handle I4fto urge the scar or dog into engagementwith the said rack 21 when released by the cam 32, which is hand shiftedby a thumb or iinger piece 34, the cam being rotatably tted on thegasket cap 3l, as best seen in Figures 5, 6, 7 and 8 of the drawing.

To operate the gun A, it is necessary to actuate the cam 32 so as tofree the plunger II which is hand pushed inwardly of the barrel I3 whenthe plunger has been set for the discharge of a determined amount ofvaccine from the gun or syringe A. Then when the desired dose isregistered by the scale, the cam is released so that when the trigger 20is pulled, the plunger H is driven inwardly to dispense the dose fromthe gun or trigger A as should be obvious. The link 25 is urged intoengagement with the rack 2l! by the device 33.

The gun or syringe A is susceptible of operation by one hand of theuser.

What is claimed is:

1. A gun of the kind described, comprising a barrel, a plunger WorkingWithin the barrel and having a stem provided with a toothed rack, ahandle grip carried by the barrel, a pull trigger pivoted to the gripand having a sear engageable With the rack for moving the plunger, agasket cap mounted on the end of said barrel, and cam means mounted onthe gasket cap on the end of the barrel through Which the plungeroperates for releasing the Sear from the rack.

2. A gun of the kind described, comprising` a barrel, a plunger WorkingWithin the barrel and having a stem provided with a toothed rack, ahandle grip carried by the barrel, a pull trigger pivoted to the gripand having a sear engageable with the rack for moving the plunger, agasket cap mountedon the end of said barrel, means for releasing thesear from the rack and cam means mounted on the gasket cap on the end ofthe barrel through which the plunger operates, for releasably urging thesear into engagement with the rack.

3. A gun of the kind described, comprising a barrel, a plunger workingWithin the barrel and having a stem provided with a toothed rack, ahandle grip carried by the barrel, a pull trigger pivoted to the gripand having a Sear engageable with the rack for moving the plunger, agasket cap mounted on the end of said barrel, means for releasing thesear from the rack, cam means mounted on the gasket cap on the end ofthe barrel through which the plunger operates for releasably urging thesear into engagement with the rack and means for adjustably clamping thegrip to the barrel.

4. A gun of the kind described, comprising a barrel, a plunger WorkingWithin the barrel and having a stem provided with a toothed rack, ahandle grip carried by the barrel, a pull trigger pivoted to the gripand having a sear engageable with the rack for moving the plunger, agasket cap mounted on the end of said barrel, cam means mounted on thegasket cap on the end of the barrel through which the plunger operatesfor releasing the sear from the rack, means for releasably urging thesear into engagement with the rack, means for adjustably clamping thegrip to the barrel and graduated scales on the stem and barrel forcoordination with each other.

FRANCIS J. SWANSON.

REFERENCES CITED The following references le of this patent:

UNITED STATES PATENTS are of record in 'the

